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If oven is electric pleace check that the heating elements are ok, could be that only one or two elements could be the only heaters hence luck power to maintain temparature when open or gets too slow to preheat.
Technician just left our house with same issue. Jenn-Air had issued a technical bulletin as the temperature probe is mounted directly to the heating element, and measures the heat of the element, not the oven. Their fix is a revised temperature probe that goes at a 90 degree angle away from the heating element.
If your temperature is consistent, just off by a set amount of degrees, there is an adjustment you can make at the control panel.
click the link
Oven temp sensors sense the temperature is the oven cavity and the temp sensor changes resistance, this change in ohm resistance tells the oven control what temperature the oven cavity at and tells the control to shut off the element or turn it back on. The most common temp sensors used today ( *not all ) are approx 1000-1100 ohm resistance at room temperature ( 70�F ) Some ohm readings and there temperature: Degrees F - Resistance 100 - 1143 ohms 200 - 1350 ohms 300 - 1553 ohms 350 - 1654 ohms 400 - 1753 ohms 500 - 1949 ohms
hummmm this sounds similar to what is happening to me. I am praying someone will have a solution, I don't want to have to explain to my daughter who is going to be 4 tomorrow, why I can't bake her cake.